diff --git a/slsReceiverSoftware/include/sls_receiver_defs.h b/slsReceiverSoftware/include/sls_receiver_defs.h
index 12958612f..11641334a 100755
--- a/slsReceiverSoftware/include/sls_receiver_defs.h
+++ b/slsReceiverSoftware/include/sls_receiver_defs.h
@@ -92,7 +92,9 @@ public:
 		MEASUREMENTS_NUMBER,
 		FRAMES_FROM_START,
 		FRAMES_FROM_START_PG,
-		SAMPLES_JCTB
+		SAMPLES_JCTB,
+		SUBFRAME_ACQUISITION_TIME, /**< subframe exposure time */
+		MAX_TIMERS
 	};